F. H. Cao, Y. Zhang, Y. Chen, M. G. Jiang, J. L. Zhou, Y. He
{"title":"高含量稀土混合铸造 AZ61 镁合金室温显微组织和性能分析与讨论","authors":"F. H. Cao, Y. Zhang, Y. Chen, M. G. Jiang, J. L. Zhou, Y. He","doi":"10.1007/s11223-024-00612-0","DOIUrl":null,"url":null,"abstract":"<p>This paper systematically analyzed and discussed the microstructure and mechanical properties of as-cast AZ61 magnesium alloy with rare-earth content of 1.0~4.0 wt.% by optical microscopy, SEM, EDS, and XRD. The results indicate that in addition to the obvious distribution of skeletal <i>β</i>-Mg<sub>17</sub>Al<sub>12</sub> phase, a small amount of Mg<sub>32</sub>(Al, Zn)<sub>49</sub> quasicrystal phase is distributed in as-cast AZ61 alloy. With the addition of rare-earth content, the skeletal <i>β</i>-Mg<sub>17</sub>Al<sub>12</sub> phase dendrites in the as-cast AZ61 magnesium alloy matrix are decomposed obviously. The dendrite decomposition is more serious with increased Rare-earth content, and the quasicrystal Mg<sub>32</sub>(Al, Zn)<sub>49</sub> disappears. When the rare-earth content is 1%Ce~2%Ce, the alloy mainly consists of needle-like, dot-like, or clustered Al<sub>4</sub>Ce and Al<sub>8</sub>Mn<sub>4</sub>Ce phases with a small amount of Al<sub>4</sub>La. When 2.8%Ce+1.2%Nd mixed rare-earth was added, the Al<sub>8</sub>Mn<sub>4</sub>Ce phase was not found in the alloy but mainly composed of Al<sub>3</sub>Nd and Al<sub>4</sub>Ce rare-earth phases. These rare-earth phases were radiative needle-like, willow leaf-like, rod-like, spot-like, layer-like, and a little irregular block. The as-cast AEZ641(2.8 wt.% Ce+1.2 wt.% Nd) magnesium alloy has the best comprehensive performance, and the yield strength is 2% higher than the as-cast AZ61 alloy. Its tensile strength, hardness, and elongation are similar to as-cast AZ61 alloy. The fracture mechanism of as-cast AZ61 + xRE is mainly a cleavage-type brittle fracture.</p>","PeriodicalId":22007,"journal":{"name":"Strength of Materials","volume":"147 1","pages":""},"PeriodicalIF":0.7000,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Analysis and Discussion on the Room Temperature Microstructure and Properties of High Content Mixed Rare-Earth As-Cast AZ61 Magnesium Alloy\",\"authors\":\"F. H. Cao, Y. Zhang, Y. Chen, M. G. Jiang, J. L. Zhou, Y. He\",\"doi\":\"10.1007/s11223-024-00612-0\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>This paper systematically analyzed and discussed the microstructure and mechanical properties of as-cast AZ61 magnesium alloy with rare-earth content of 1.0~4.0 wt.% by optical microscopy, SEM, EDS, and XRD. The results indicate that in addition to the obvious distribution of skeletal <i>β</i>-Mg<sub>17</sub>Al<sub>12</sub> phase, a small amount of Mg<sub>32</sub>(Al, Zn)<sub>49</sub> quasicrystal phase is distributed in as-cast AZ61 alloy. With the addition of rare-earth content, the skeletal <i>β</i>-Mg<sub>17</sub>Al<sub>12</sub> phase dendrites in the as-cast AZ61 magnesium alloy matrix are decomposed obviously. The dendrite decomposition is more serious with increased Rare-earth content, and the quasicrystal Mg<sub>32</sub>(Al, Zn)<sub>49</sub> disappears. When the rare-earth content is 1%Ce~2%Ce, the alloy mainly consists of needle-like, dot-like, or clustered Al<sub>4</sub>Ce and Al<sub>8</sub>Mn<sub>4</sub>Ce phases with a small amount of Al<sub>4</sub>La. When 2.8%Ce+1.2%Nd mixed rare-earth was added, the Al<sub>8</sub>Mn<sub>4</sub>Ce phase was not found in the alloy but mainly composed of Al<sub>3</sub>Nd and Al<sub>4</sub>Ce rare-earth phases. These rare-earth phases were radiative needle-like, willow leaf-like, rod-like, spot-like, layer-like, and a little irregular block. The as-cast AEZ641(2.8 wt.% Ce+1.2 wt.% Nd) magnesium alloy has the best comprehensive performance, and the yield strength is 2% higher than the as-cast AZ61 alloy. Its tensile strength, hardness, and elongation are similar to as-cast AZ61 alloy. The fracture mechanism of as-cast AZ61 + xRE is mainly a cleavage-type brittle fracture.</p>\",\"PeriodicalId\":22007,\"journal\":{\"name\":\"Strength of Materials\",\"volume\":\"147 1\",\"pages\":\"\"},\"PeriodicalIF\":0.7000,\"publicationDate\":\"2024-02-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Strength of Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1007/s11223-024-00612-0\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, CHARACTERIZATION & TESTING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Strength of Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s11223-024-00612-0","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, CHARACTERIZATION & TESTING","Score":null,"Total":0}
Analysis and Discussion on the Room Temperature Microstructure and Properties of High Content Mixed Rare-Earth As-Cast AZ61 Magnesium Alloy
This paper systematically analyzed and discussed the microstructure and mechanical properties of as-cast AZ61 magnesium alloy with rare-earth content of 1.0~4.0 wt.% by optical microscopy, SEM, EDS, and XRD. The results indicate that in addition to the obvious distribution of skeletal β-Mg17Al12 phase, a small amount of Mg32(Al, Zn)49 quasicrystal phase is distributed in as-cast AZ61 alloy. With the addition of rare-earth content, the skeletal β-Mg17Al12 phase dendrites in the as-cast AZ61 magnesium alloy matrix are decomposed obviously. The dendrite decomposition is more serious with increased Rare-earth content, and the quasicrystal Mg32(Al, Zn)49 disappears. When the rare-earth content is 1%Ce~2%Ce, the alloy mainly consists of needle-like, dot-like, or clustered Al4Ce and Al8Mn4Ce phases with a small amount of Al4La. When 2.8%Ce+1.2%Nd mixed rare-earth was added, the Al8Mn4Ce phase was not found in the alloy but mainly composed of Al3Nd and Al4Ce rare-earth phases. These rare-earth phases were radiative needle-like, willow leaf-like, rod-like, spot-like, layer-like, and a little irregular block. The as-cast AEZ641(2.8 wt.% Ce+1.2 wt.% Nd) magnesium alloy has the best comprehensive performance, and the yield strength is 2% higher than the as-cast AZ61 alloy. Its tensile strength, hardness, and elongation are similar to as-cast AZ61 alloy. The fracture mechanism of as-cast AZ61 + xRE is mainly a cleavage-type brittle fracture.
期刊介绍:
Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.